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A propeller for a prop-jet engine having a propellor blade formed as a hollow shell member whose outer surface has an aerodynamic blade profile, the propellor blade being secured to a rotor via an adjustment pin. The hollow shell member is internally braced partly along its radial length by a flexib

A propeller for a prop-jet engine having a propellor blade formed as a hollow shell member whose outer surface has an aerodynamic blade profile, the propellor blade being secured to a rotor via an adjustment pin. The hollow shell member is internally braced partly along its radial length by a flexible spar secured to the pin and made of thermoplastic material. The flexible spar is hollow and receives a metal spar hich is fixed to the pin and is given flexibility in bending by the provision of a slot therein.

대표청구항 ▼

A deflectable blade assembly for a prop-jet engine comprising a metallic pin mountable in a rotor and including a shank and an enlarged head on said shank, a hollow shell member secured to said head and projecting from the rotor, said shell member having an outer surface forming an aerodynamic blade

A deflectable blade assembly for a prop-jet engine comprising a metallic pin mountable in a rotor and including a shank and an enlarged head on said shank, a hollow shell member secured to said head and projecting from the rotor, said shell member having an outer surface forming an aerodynamic blade profile, a first spar of fiber material fixed to said pin, said first spar projecting from said pin and being incorporated into said hollow shell member to supportably engage said shell member to permit said shell member to undergo elastic deformation upon application of lateral force thereto with bending of said shell member and said first spar, said spar defining a hollow interior, a second spar of metal fitted within the hollow interior of said first spar, and means securing said second spar to said pin.